Fix inconsistencies between offline/online spawn position getter (#11960)

paper-api/src/main/java/org/bukkit/OfflinePlayer.java

@@ -287,13 +287,28 @@ public interface OfflinePlayer extends ServerOperator, AnimalTamer, Configuratio
     // Paper end
 
     /**
-     * Gets the Location where the player will spawn at, null if they
+     * Gets the Location where the player will spawn at, {@code null} if they
+     * don't have a valid respawn point.
+     * <br>
+     * Unlike online players, the location if found will not be loaded by default.
+     *
+     * @return respawn location if exists, otherwise {@code null}.
+     * @see #getRespawnLocation(boolean) for more fine-grained control over chunk loading and validation behaviour.
+     */
+    default @Nullable Location getRespawnLocation() {
+        return this.getRespawnLocation(false); // keep old behavior for offline players
+    }
+
+    /**
+     * Gets the Location where the player will spawn at, {@code null} if they
      * don't have a valid respawn point.
      *
-     * @return respawn location if exists, otherwise null.
+     * @param loadLocationAndValidate load the expected respawn location to retrieve the exact position of the spawn
+     *                                block and check if this position is still valid or not. Loading the location
+     *                                will induce a sync chunk load and must hence be used with caution.
+     * @return respawn location if exists, otherwise {@code null}.
      */
-    @Nullable
-    public Location getRespawnLocation();
+    @Nullable Location getRespawnLocation(boolean loadLocationAndValidate);
 
     /**
      * Increments the given statistic for this player.